What is the best way to pass JSON data into a JavaScript function?

As a beginner in javascript, I have been struggling to find a solution for my problem for a week.

The code example I am working with is shown below (all within an HTML page in the head tag)

//example function 1

    function randomString(len, charSet) {
            charSet = charSet || 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
            var randomString = '';
            for (var i = 0; i < len; i++) {
            var randomPoz = Math.floor(Math.random() * charSet.length);
            randomString += charSet.substring(randomPoz,randomPoz+1);
        }
            return randomString;
    }



//example function 2
        function tests(randomString) {

                alert(randomString);

        }

//example function 3 pull data from JSON to div id test

        $(document).ready(function() { 
           $.getJSON("http://www.test.com/get_json_data.php?", {
                    cat_id: "3",
                    type:'GET',
                    dataType: 'json',
              }, function(data) {
                    $.each(data.items, function(i, item) {


                    $('#test').append('<a href="#" onclick="tests(randomString(5))"><img src="http://www.test.com/images/'+item.image+'"/></a>'); 

                  if (i == 10) return false;
                   });
              });
           });

My issue arises when trying to insert a variable from the JSON data (e.g. "item.id") into the "onclick" event. I attempted to achieve this using the following code:

onclick="tests(randomString(5)+item.id)"

The desired outcome is to display an alert containing 5 random characters followed by the item.id, for instance:

xIyax33 (where 33 is item.id)
TwQpu34 (where 34 is item.id)
AERim35 (where 35 is item.id)

However, I keep encountering an error stating "item is not defined."

Can anyone offer suggestions on how I can modify the code to successfully incorporate variables from the JSON data?

Answer №1

To enhance your randomString() function, include a new parameter named id to retrieve the item.id. This id should be concatenated with the existing randomString.

function randomString(length, id, charSet) {//additional param
     charSet = charSet || 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
     var randomString = '';
     for (var i = 0; i < length; i++) {
         var randomIndex = Math.floor(Math.random() * charSet.length);
         randomString += charSet.substring(randomIndex, randomIndex + 1);
     }
     return randomString + id; //concatenate with id
 }

Update your append method as follows:

$('#test').append('<a href="#" onclick="tests(randomString(5,'+item.id+'))"><img src="http://www.updated.com/images/'+item.image+'"/></a>');

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